Gfrktyl

Hi I was wondering how to fix g++ and build essential. This is what it keeps saying:

Setting up g++ (4:8.2.0-1ubuntu1) ...

update-alternatives: error: /var/lib/dpkg/alternatives/c++ corrupt: invalid status

dpkg: error processing package g++ (--configure):

 installed g++ package post-installation script subprocess returned error exit status 2

dpkg: dependency problems prevent configuration of build-essential:

 build-essential depends on g++ (>= 4:7.3); however:

  Package g++ is not configured yet.

Now I can't install anything

$ sudo apt-get install g++

Reading package lists... Done

Building dependency tree       

Reading state information... Done

g++ is already the newest version (4:8.2.0-1ubuntu1).

The following packages were automatically installed and are no longer required:

  fprintd gir1.2-accountsservice-1.0 gir1.2-gck-1 gir1.2-gcr-3

  gir1.2-gdesktopenums-3.0 gir1.2-gdm-1.0 gir1.2-gnomebluetooth-1.0

  gir1.2-gnomedesktop-3.0 gir1.2-gweather-3.0 gir1.2-nm-1.0 gir1.2-nma-1.0

  gir1.2-rsvg-2.0 gir1.2-upowerglib-1.0 gjs glib-networking:i386

  gnome-control-center-faces gnome-shell-common gnome-todo-common libargon2-0

  libaspell15:i386 libatk-bridge2.0-0:i386 libatk1.0-0:i386 libatspi2.0-0:i386

  libboost-date-time1.65.1 libboost-locale1.65.1 libboost-thread1.65.1

  libbrotli1:i386 libcairo-gobject2:i386 libcamel-1.2-61 libcolord-gtk1

  libcolord2:i386 libcomerr2:i386 libdatrie1:i386 libdazzle-1.0-0

  libdns-export1100 libebook-1.2-19 libedata-cal-1.2-29 libenchant1c2a:i386

  libepoxy0:i386 libfprint0 libfribidi0:i386 libgdk-pixbuf2.0-0:i386 libgdm1

  libgjs0g libglvnd0:i386 libgnome-todo libgraphene-1.0-0 libgraphite2-3:i386

  libgudev-1.0-0:i386 libharfbuzz-icu0:i386 libharfbuzz0b:i386

  libhunspell-1.6-0:i386 libhyphen0:i386 libjson-glib-1.0-0:i386 liblouis14

  libmagickcore-6.q16-3 libmagickcore-6.q16-3-extra libmagickwand-6.q16-3

  libmozjs-60-0 libnotify4:i386 libpam-fprintd libpango-1.0-0:i386

  libpangocairo-1.0-0:i386 libpangoft2-1.0-0:i386 libpoppler73 libprocps6

  libproxy1v5:i386 libpsl5:i386 libraw16 librest-0.7-0:i386 libsecret-1-0:i386

  libsoup-gnome2.4-1:i386 libsoup2.4-1:i386 libspeexdsp1:i386 libstdc++-7-dev

  libsysmetrics1 libthai0:i386 libwebpdemux2:i386 libwoff1:i386 libxcb-res0

  libxkbcommon0:i386 linux-headers-4.15.0-44 linux-headers-4.15.0-44-generic

  linux-image-4.15.0-44-generic linux-modules-4.15.0-44-generic

  linux-modules-extra-4.15.0-44-generic mutter-common nplan

  python3-macaroonbakery python3-nacl python3-protobuf python3-pymacaroons

  python3-rfc3339 python3-tz switcheroo-control xwayland

Use 'sudo apt autoremove' to remove them.

0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

2 not fully installed or removed.

After this operation, 0 B of additional disk space will be used.

Do you want to continue? [Y/n] y

Setting up g++ (4:8.2.0-1ubuntu1) ...

update-alternatives: error: /var/lib/dpkg/alternatives/c++ corrupt: invalid status

dpkg: error processing package g++ (--configure):

 installed g++ package post-installation script subprocess returned error exit status 2

dpkg: dependency problems prevent configuration of build-essential:

 build-essential depends on g++ (>= 4:7.3); however:

  Package g++ is not configured yet.



dpkg: error processing package build-essential (--configure):

 dependency problems - leaving unconfigured

No apport report written because the error message indicates its a followup error from a previous failure.

Errors were encountered while processing:

 g++

 build-essential

E: Sub-process /usr/bin/dpkg returned an error code (1)



dpkg: error processing package build-essential (--configure):

 dependency problems - leaving unconfigured

Errors were encountered while processing:

 g++

 build-essential

This appears very similar to this. I've adapted the accepted answer here:

The alternatives entries are broken.

1. 
   

   You should remove them with:

   
   
   
   
   

   sudo update-alternatives --remove-all c++
   
   sudo rm -f /etc/alternatives/c++ /var/lib/dpkg/alternatives/c++
   
   

   
   
   

   If update-alternatives complains about corrupt files again, ignore it and just proceed to delete them with the next command.

   
   



2. Reinstall dependencies with sudo apt-get -f install



3. 
   

   Then re-install their packages with:

   
   
   

   sudo apt-get install --reinstall c++
   
   

   
   
   

   This will restore the alternatives entries according to the packages available on your system.

   
   



4. Proceed analogously for any further corrupted entries.